28191301 has 2 divisors, whose sum is σ = 28191302. Its totient is φ = 28191300.

The previous prime is 28191281. The next prime is 28191323. The reversal of 28191301 is 10319182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 7986276 = 4495^2 + 2826^2 .

It is a cyclic number.

It is not a de Polignac number, because 28191301 - 2¹³ = 28183109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28191341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14095650 + 14095651.

It is an arithmetic number, because the mean of its divisors is an integer number (14095651).

Almost surely, 2^28191301 is an apocalyptic number.

It is an amenable number.

28191301 is a deficient number, since it is larger than the sum of its proper divisors (1).

28191301 is an equidigital number, since it uses as much as digits as its factorization.

28191301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 28191301 is about 5309.5480975315. The cubic root of 28191301 is about 304.3488788094.

The spelling of 28191301 in words is "twenty-eight million, one hundred ninety-one thousand, three hundred one".